An inorganic compound ' X ' on treatment with concentrated \({H}_{2}S{O}_{4}\) produces brown fumes and gives dark brown ring with \(FeS{O}_{4}\) in presence of concentrated \({H}_{2}S{O}_{4}\). Also compound ' X ' gives precipitate ' Y ', when its solution in dilute HCl is treated with \({H}_{2}S\) gas. The precipitate ' Y ' on treatment with concentrated \(HN{O}_{3}\) followed by excess of \(N{H}_{4}OH\) further gives deep blue coloured solution, Compound ' X ' is:

[JEE Main 2021, 20 Jul (Shift 1)]

Question

An inorganic compound ' X ' on treatment with concentrated \({H}_{2}S{O}_{4}\) produces brown fumes and gives dark brown ring with \(FeS{O}_{4}\) in presence of concentrated \({H}_{2}S{O}_{4}\). Also compound ' X ' gives precipitate ' Y ', when its solution in dilute HCl is treated with \({H}_{2}S\) gas. The precipitate ' Y ' on treatment with concentrated \(HN{O}_{3}\) followed by excess of \(N{H}_{4}OH\) further gives deep blue coloured solution, Compound ' X ' is:

[JEE Main 2021, 20 Jul (Shift 1)]

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